Multiple vacuum tube



Aug. 6, 1940. w SQLLER 2,210,010

MULTIPLE VACUUM TUBE Original Filed Jan. 51, 1935 5 Sheets-Sheet 1 INVENTOR.

I I: i Wag/2w 0 Aug. 6, '1940. I w. SOLLER 2.210,010

MULTIPLE VACUUM TUBE Original Filed Jan; 31, 1935 3 Sheets-Sheet 2 Aug. 6, 1940. w. SOLLER MULTIPLE VACUUM TUBE Original Filed Jan. 51, 1955 3 Sheets-Sheet 3 a J 00 a /Q T IILI INVENTOR. L warm/0 asp/66w BY & d ATTORNEY 7 Patented Aug. 6, 1940 OFFICE MULTIPLE) TUB]? .Walter Seller, Cincinnati, Ohio, assignon owns A half to. William H. Wo0din,'Jr.,'Ti1cson, Ariz.

Original application JanuaryZiI, 1935,; S'erialNo;

Divided and this application: 2, 1939, Serial No. 254,301

February I p 6. Claims. (01- 25 1 My invention relates broadlyto electron tube devices and more. particularly to a. multiple electrode structure in an electron tube for multiple circuit'operation'.

This application is a division of my copending;

application. Serial-Number 4,393, filed January 31, 1935, for Television system; and the electron tube herein described is intended principally for use as an amplifier of the plurality of simultane-f ously transmitted video signal currents in televisionsystems of my invention, such as described in the aforesaid copending' application.

One of the objects of my invention is to providea multiple electron tube of unitary construction for independently conducting separate components of a complex signal.

, Another object of my invention is to provide a construction of multiple element electron tubefor the separate amplification of the modulated currents of different frequencies in a television receiver adapted for the simultaneous use thereoil A further object of my invention is to provide a construction of multiple electron tube having a.

common cathode electrode and a plurality of independent control grid and anode combinations associated therewith for separate operation in respect to individualsignal components.

Still another object of myinventionis to provide electronic shielding means intermediate different control grid and anode electrodes in a multiple electron tube structure, wherebysep arate electron streams from different portions of a common cathode extending through all. of the compartments formed by the shielding means maybe independently controlled by said control grids and receivedat the respective anode electrodes.

A still further object of my invention is to prov vide a construction of screen grid for a multiple compartment electron vtube of the type above described, with the screen'grid substantially coextensive with the cathode and likewise common to the different control grid and anode electrodes. Anotherobject ofmy inventionis to provide a construction of screen grid electrode asdescribed and wherein the screen grid is cooperatively related to the structural as well as. the. electrical characteristics of the electron tube. so that the.

7. tube structure is made compact, rigid, and. substantially uniform and dependable in performance.. 7

Other and further objects reside in the constructional and electrical features of. the multiple electron tube oi my inventionherei-nafter described; immo-re detail'with reference to'the ac:- companying drawings in. which: 1

Figure 1 is ajvertical sectional view through; a; multipleunit, multiple electrode electron tube. of my inventiontakensubstantially online' l"-l; in Fig. 2;;Fig. 27 is a horizontal. crossesectional view of; the electron tubeshown in- Fig. 1'; Fig.v 3- is. a partial: vertical. sectional view on an; en' largedz scale; taken. on line 3'-3' in Fig. 2-; Fig. 4. is a cross-sectional view showing. a modified. 00m struction; Figs-545 a; perspective view of the: elements. ofath'e; multiple electron tube of my invention in. disassembled relation; and Figs. 6;. 7'"

and 8:are schematic diagrams; showing a number. l

of currents as. delivered from the frequency separating apparatusne'edinot be of the magnitude required 'for operating the picture producing. means, as. amplification is. readily provided the multiple electron. tube of my invention herein described; 1 I

Referring'to the drawings in more detail, Fig. 1 shows the multipleelectron tube of my invention in two vertical sectional portions, the upper" substaritiallyta cross" section diametrically of the tube, and the: lower a section" within the glass en velope :lli showing-the screen grid in elevation.

A common cathode electrode, 15, is supported centrally of; the glass envelope 16'. A heater element, 1.8, is disposed within the cathode. A multiplicityof control grid and anode electrodes, designated generally by reference characters 19 and 80, respectively is provided. Between each set of control grid-and anode electrodes is provided a separator partition consisting of two discs ofmica, designated'by 8i, and an intermediate disc 8 2 of metal. The metal disc is provided with a larger aperture Slain the center than are the two mica discs, the apertures Bid in which 'aresubstantially the diameter of the cathode 15.. The

mica discs are adapted. to be spaced along the.

potentialsurfacesto serve as shields-between. the

Fig. 2 is a cross-sectional View of the tube shown,

in Fig. 1 and shows the glass press forms which seal the connections to the several anode and control grid elements.

Fig. 3 is an enlarged vertical sectional view onan axis displaced 90 with respect to-the axis of the vertical section shown in Fig. 1. Fig. 3 illus-'- trates particularly the disposition of the elements in the sections of the multisection amplifier tube 76, showing the heater I8, the'catho'de I5, the control grid I9, the anode 80, and the screen grid 83 in assembled relation; and showing also the mica discs 8| and the metal disc 82 arranged as a shielding partition between the sections, the mica discs being disposed on either side of the metal disc and insulating it from the electrodes.

The manner in which the partitions are sup-port edin the slots 83b in the screen parent from Fig. 3.

Fig.4 is a cross-sectional'view s'howing'a modified form of the electron tube of-my' invention. Means are shown in' Fig. 4 whereby the connecgrid 83 is aptions to the several grid electrodes are broughtout in a staggered arrangement thereby lessening'interterminal capacity effects.

Fig. 5 is a perspective view of the elements of the electron tube of Fig. 1 shown in' disassembled relation. The simplicity of the component parts is evident from this illustration thereof separately; It.-is intended that the parts be assembled in the most convenient and efiicient manner} with but one specific requirementythat is, that thecathode be inserted through' the' aperturesin laminations 8I, 82, and through grids-19 after all .theseselementsare in proper relation inconjunction with screen grid 83 and the anode electrodes 80. The inherent stiffness of the assembly due to the structure of the screen grid and sep arator la'minations is preserved by the sealing of the rod supports of the various electrodes in the glass-envelope I6.

The control grid electrode I9 is preferably cylindrical in form as shown, 'but'may'be provided in an open sided form for insertion after the cathode is mounted'in the apertures of the separator laminations 8I 82. The other elements also may be of modified form, 'within' the scope of my invention, while preserving theparticular features and operational characteristics of my invention.

Fig; 6 is a schematic diagram showing one arrangement of apparatus in a television receiving system of my invention, of the type shown in my application Serial Number 4,393,,- supra. Condenser II I, connected to the output circuit of the conventional television receiver, offersa high impedance to currents of scanningfrequency but a low impedance to currents of light modulated carrier frequency while the choke coil, I I1 offers low impedance to currents of scanning. frequency and high impedance to the lightmodul'atedcarrier frequency currents. The output of the condenser branch of this filter circuit is connected,

in this arrangement, to vibrating reed frequency through an amplifying tube I20, to an oscillating coil in the picture producing apparatus. Means for adjusting the amplitude and the synchronism of this current are provided at I2I and I23, respectively.

Fig. 7 shows a receiving system similar to that of Fig. 6 but employing vibrating wire frequency separator apparatus at I28 of the type shown in my copending application Serial Number 4,393, supra, instead of :the vibrating reed apparatus atI I8 in Fig. 6. The arrangements of Figs. 5 and 6 are otherwise similar. The use of the electronic vibrating wire apparatus I28 to supply the input voltages for the tube I24 requires an additional source of power for the anodes thereof. Source I is local to the vibrating wire apparatus, providing simply bias potential. Thevoltage of source I36 is divided by resistors I31, I38, I39 and I40,

that acrossresistor I37 supplying anode potential to the electronic vibrating wire apparatus I28, through resistors I4I' which provide the control voltages applied to the individual control grids of the multiple amplifier tube'I 24. The potential drop across resistor I38 supplies bias potential for the control grids of tube I24; and that across resistor I39, the bias potential for the screen grid.

The voltage across resistors I39 and I40 deter-,

mines the potential of the anodes of tube I24 with respect to the cathode, the same being applied through the light units of the picture apparatus H9. Resistors I 38, I39, I40 are the equivalent of the battery sources shown connected with the tube I24 in Fig. 6, as is more apparent with reference to Fig. 8 wherein the same vibrating reed frequency separator units II8 are employed for energizing the control grids of tube I24; the potential drop across resistor I38 supplies the 'bias potential for the control grids of tube I24, Fig.8, the same being applied through the separate coils of the vibrating reed units II8.

The potential drop across resistor I39, Fig. 8, supplies screen grid bias, as in Fig. 7, and together with the voltage across resistor I40 supplies operating potential to the anodes. The electronic picture apparatus I25, Fig. 8, is a picture tube of the type shown in my copending application Serial Number 733,300, filed June 30, 1934, renewed December 9, 1938, for Television system; and resistors I42 are provided in the anode circuits of the multiple amplifier tube I24 to provide operating potentials for the grid electrodes of the picture tube. Other operating voltages for the picture tube are derived from the source I36 by additional resistors, as indicated.

Thus, while I have described my invention in certain preferred embodiments and applied, by way of example, to different circuit arrangements, I desire it understood that modifications may be made in the structure and adaptation of the device within the scope of my invention, and

that no limitations upon my invention are in-' tended except as are imposed by the scope of the appended claims.

What I claim as new and desire to secure by supports connected with each Letters Patent of the United States is as follows:

1. Means for individually amplifying each of a plurality of currents comprising a multiple section electron tube, said tube including a common cathode electrode, a heater element for said cathode electrode, a common screen grid electrode, a plurality of control grid electrodes, a corresponding plurality of anode electrodes, and a plurality of partitions each comprising a pair of mica discs and a metal disc mounted therebetween, said discs being apertured to pass the common cathode electrode therethrough, the aperture in said metal disc being larger than the apertures in said mica discs, said screen grid electrode being slotted to accommodate said partitions, one of said anode electrodes and one of said control grid electrodes supported in each of the sections formed by said partitions, terminal of said anode and control grid electrodes, said screen grid being arranged to envelop said anode electrodes and being provided with passageways allowing the entrance of said terminal supports, and an evacuated glass envelope enclosing the above mentioned elements of said tube and providing supporting means therefor.

2. An electron tube comprising an elongated envelope, a plurality of anode electrodes supported from one side wall of said envelope, a corresponding plurality of control grid electrodes supported from the opposite side wall of said envelope, with said grid and anode electrodes substantially coaxial and operatively arranged in pairs, a cathode electrode common to all said pairs of grid and anode electrodes and extending coaxially therewith, insulated shield means arranged normal to said cathode and disposed intermediate the several pairs of grid and anode electrodes, and means for supporting said shield means consisting of a screen grid electrode common to all said pairs of grid and anode electrodes and substantially coextensive with said cathode, and having transverse slots therein for supporting saidshield means.

3. A multiple electron tube comprising a single cathode electrode, corresponding pluralities of anode and control grid electrodes operatively arranged in pairs with respect to said cathode, and a screen grid electrode of double wall formation and substantially cylindrical in form, and havin a longitudinal opening to the space between the double walls thereof and a longitudinal passage into the space within the inner wall thereof, means extending through said opening for supporting said anode electrodes in the space between the walls of said screen grid, and means extending through said passage for supporting said control grid electrodes in the space within the inner wall of said screen grid, said cathode being mounted substantially coaxial with said screen grid electrode.

4. A multiple electron tube comprising single cathode and screen grid electrodes, and corresponding pluralities of control grid and anode electrodes, with partition shield means disposed between cooperative pairs of anode and grid electrodes, and said screen grid constructed to supportsaid means in position.

5. A multiple electron tube comprising single cathode and screen grid electrodes, corresponding pluralities of control grid and anode electrodes cooperative in pairs with respect to said cathode and screen grid electrodes, and dual insulating laminations and an intermediate conductive lamination constituting a partition shield member disposed between each pair of said control grid and anode electrodes, said screen grid having transverse slots therein adapted to receive and support said partition shield member.

6. A multiple electron tube comprising a substantially cylindrical envelope, a pencil-like cathode electrode mounted centrally of said envelope; a double Walled substantially cylindrical screen grid electrode mounted coaxially of said envelope and having a longitudinal opening to the space between the double walls thereof and a longitudinal passage into the space within the inner wall thereof, said screengrid electrode having transverse slots therein; partition shield members comprising dual insulating laminations and an intermediate conductive lamination mounted in the slots in said screen grid electrode, said members being centrally apertured to pass said cathode electrode in insulated relation; a plurality of substantially cylindrical unitary control grid electrodes mounted coaxial with said cathode intermediate said partition members, each said control grid electrode having a supporting rod connector attached thereto extending through the passage in said screen grid electrode and through said envelope in insulated relation; and a corresponding plurality of arcuate shaped unitary anode electrodes mounted coaxial with said control grid electrodes intermediate said partition members and between the double walls of said screen grid electrode, each said anode electrode having a supporting rod connector attached thereto extending through the opening in said screen grid electrode and through said envelope in insulated relation; and means for making electrical connection with said cathode and screen grid electrodes.

Y WALTER SOLLER. 

